Someone just asked this, I replied @ https://github.com/keepassx/keepassx/pull/52#issuecomment-44222530 https://github.com/keepassx/keepassx/pull/52#issuecommen

Someone just asked this, I replied @ https://github.com/keepassx/keepassx/pull/52#issuecomment-44222530 https://github.com/keepassx/keepassx/pull/52#issuecomment-44... > Instead you can generate and save the 20 byte HMAC secret prior to programming the YubiKey. You could then program an infinite number of other YubiKeys with the same secret. See the screenshot in the PR showing the Yubico GUI tool, note the key field.